edu.udo.cs.yale.operator.features.construction
Class GeneratingMutation

java.lang.Object
  edu.udo.cs.yale.operator.features.IndividualOperator
      edu.udo.cs.yale.operator.features.construction.GeneratingMutation

All Implemented Interfaces:

PopulationOperator

public class GeneratingMutation
extends IndividualOperator

The mutation operator for YAGGA. This operator adds single attributes from the original set, creates new ones and deselect single attributes.

Version:

$Id: GeneratingMutation.java,v 1.1 2006/04/14 07:47:17 ingomierswa Exp $

Author:

Ingo Mierswa, Simon Fischer

See Also:

YAGGA

Field Summary

private java.util.List<FeatureGenerator>	generators
private int	maxDepth
private int	maxNumberOfAttributes
private java.util.List<Attribute>	originalAttributes
private double	prob
private RandomGenerator	random
private java.lang.String[]	unusedFunctions

Constructor Summary

GeneratingMutation(java.util.List<Attribute> originalAttributes, double prob, int maxNumberOfAttributes, java.util.List<FeatureGenerator> generators, RandomGenerator random)

Method Summary

private boolean	addGeneratedAttribute(AttributeWeightedExampleSet exampleSet, double p) Adds a new attribute.
private void	addOriginalAttribute(AttributeWeightedExampleSet exampleSet, double p)
private void	deselect(AttributeWeightedExampleSet exampleSet, int m, double p)
java.util.List<Individual>	operate(Individual individual) Performs one of the following three mutations: add a newly generated attribute add an original attribute remove an attribute
void	setMaxConstructionDepth(int maxDepth)
void	setUnusedFunctions(java.lang.String[] functions)

Methods inherited from class edu.udo.cs.yale.operator.features.IndividualOperator

operate, performOperation

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

generators

private java.util.List<FeatureGenerator> generators

originalAttributes

private java.util.List<Attribute> originalAttributes

prob

private double prob

maxNumberOfAttributes

private int maxNumberOfAttributes

random

private RandomGenerator random

maxDepth

private int maxDepth

unusedFunctions

private java.lang.String[] unusedFunctions

Constructor Detail

GeneratingMutation

public GeneratingMutation(java.util.List<Attribute> originalAttributes,
                          double prob,
                          int maxNumberOfAttributes,
                          java.util.List<FeatureGenerator> generators,
                          RandomGenerator random)

Method Detail

setMaxConstructionDepth

public void setMaxConstructionDepth(int maxDepth)

setUnusedFunctions

public void setUnusedFunctions(java.lang.String[] functions)

operate

public java.util.List<Individual> operate(Individual individual)
                                   throws java.lang.Exception

Performs one of the following three mutations:

• add a newly generated attribute
• add an original attribute
• remove an attribute

Specified by:

operate in class IndividualOperator

Throws:

java.lang.Exception

addGeneratedAttribute

private boolean addGeneratedAttribute(AttributeWeightedExampleSet exampleSet,
                                      double p)
                               throws java.lang.Exception

Adds a new attribute. Returns true, if generation was possible.

Throws:

java.lang.Exception

addOriginalAttribute

private void addOriginalAttribute(AttributeWeightedExampleSet exampleSet,
                                  double p)

deselect

private void deselect(AttributeWeightedExampleSet exampleSet,
                      int m,
                      double p)